Christ: "A Noble Theme"

Psalm 45:1 "My heart is stirred by a noble theme." But what is this theme? The psalmist goes on to say that his song is for, is about, is to, the 'king'. It's also about his bride and their marriage. But who or what is this 'KING' and who or what is the bride?

People have given many answers, some more satisfactory than others, but to bring the matter closer home, to make it more relevant to us, to make it more practical: what is the centre, what is the heart of your religion? You will answer, "Obviously it is God." But I ask further, what about God? To say that God is the centre of your religion is somewhat vague. What do you mean when you say 'God' is the heart of your religion?